| 摘要 |
PROBLEM TO BE SOLVED: To provide a stack ring capable of eliminating the nonconformity of steam leaking, because of the generation of a clearance between the seal surfaces in deformation of an inlet sleeve. SOLUTION: The contact surfaces of small-diameter stack rings 102 and large- diameter stack rings 101, which are alternately laminated between the outer peripheral surface of an inlet sleeve 3 for supplying steam to an inner casing and the inner peripheral surface of an introducing hole 7 formed on the inner casing 5 and for preventing steam from leaking to the outside of the inner casing, are processed into radially recessed and projecting spherical surfaces and then fitted to each other, so as to prevent leakage of steam, even in deformation of the inlet sleeve. Therefore, even if the inlet sleeve is deformed, clearance is not generated between the seal surfaces of the laminated small-diameter stack rings and the large-diameter stack rings, leakage of steam is reduced, performance of a steam turbine is improved, and power generating efficiency is improved. Furthermore, in deformation of the inlet sleeve due to aging, the small-diameter stack rings and the large-diameter stack rings can be installed, without correcting the inlet sleeve deformation, changing the inlet sleeve, and changing the structures of them, and the seal surfaces which do no have leakages can be formed.
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